-LRB- CNN -RRB- -- An Illinois woman and her boyfriend , already charged with aiding in the abduction of the woman 's 6-year-old grandson , face new charges of tampering with a witness in the case , officials said Tuesday .

Ricky Chekevdia , 6 , allegedly was hidden with his mother in a secret room in his grandmother 's house .

Diane Dobbs and Robert Sandefur , both 51 , are in jail pending the filing of formal charges in the case , said Beth Sandusky , victim services coordinator for the state attorney 's office in Franklin County , Illinois .

The two were charged previously with aiding and abetting child abduction , a felony , according to Sandusky and court records .

They were released from jail on bond Monday , but were back in custody within hours , according to ABC News and CNN affiliate WSIL .

Last week , authorities found Ricky Chekevdia , Dobbs ' grandson , at her home . The boy was hiding along with his mother , Shannon Wilfong , in a secret room built to hide them -- an area about 5 feet by 12 feet , with a 4-foot ceiling , according to WSIL .

Police say the boy had been hidden for nearly two years .

Wilfong , 30 , is jailed on felony child abduction charges and made her first court appearance Tuesday , Sandusky said .

`` We let him out of the car and he ran around like he 'd never seen the outdoors , '' Master Sgt. Stan Diggs with the Illinois State Police told WSIL . `` It was actually very sad . ''

In an interview on ABC 's `` Good Morning America '' on Monday , before she was arrested , Dobbs disputed the accusation that Ricky was hidden in the small room , saying that in two years he spent `` maybe five minutes '' there .

`` My grandson had the run of the house , '' she said . `` When we were outside , we would go fishing , we would do weenie roasts . We 've done fireworks on the Fourth of July . He 's helped me plant my flower garden in the back . ''

She said she would not plead guilty to the charges . `` We were on our own and we had to do what we had to do and that was make sure our grandson was safe , '' Dobbs said .

Sandusky would not comment on the pending charges against Dobbs and Sandefur or identify the witness . However , a woman told WSIL she called police after Dobbs and Sandefur came onto her property and threatened her son 's life .

Diggs told WSIL that Ricky is `` in very good spirits for someone who 's been isolated in that house . ... He 's a very , very social , very polite , very talkative little boy . ''

Wilfong and Ricky 's father , Michael Chekevdia , had battled over custody since Ricky was born in 2002 , the St. Louis Post-Dispatch reported . They initially had joint custody , Chekevdia told the newspaper , but Wilfong would often fail to bring the boy for weekends or scheduled meetings , then in 2007 failed to show up for visitation hearings . A judge granted Chekevdia temporary custody , but by then Wilfong and the boy had disappeared . They were reported missing in November , and in December , prosecutors charged Wilfong with felony child abduction .

Wilfong and Dobbs had accused Chekevdia of sexually abusing the boy , but authorities have said those allegations are unfounded , the Post-Dispatch said .

Leaving court Tuesday , a tearful Wilfong denied any wrongdoing to reporters , and accused Chekevdia of making lewd comments about the child . She added that the boy feared returning to his father .

But Chekevdia told WSIL that Wilfong and her family are `` accusing me unjustly . ''

`` I was the best father I could be given the time that I had with him , '' he said .

Ricky was taken into Illinois Department of Children and Family Services custody , and is staying with his father 's family under child welfare supervision , WSIL said . The department declined comment .

Chekevdia told the station he got to see his son smile for the first time at a Labor Day parade . `` It was just a wonderful feeling to see a little boy that 's been in that situation for so long enjoy himself , '' he said .

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NEW : Boy 's parents had battled over his custody since his birth in 2002

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Grandmother and her boyfriend are in jail pending formal charges

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Mother , Shannon Wilfong , tearfully denies any wrongdoing

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Boy is staying with father 's family under child welfare supervision , station reports